By continuing to use this site, you agree to our use of cookies. Find out more

Cucumber 2

A Unusual canard biplane from the 1950`s

All Topics | Latest Posts

Search for:  in Thread Title in  
Stephen Jones12/02/2009 20:24:18
avatar
2901 forum posts
1657 photos
Hi , wood worms
Iam considering  building a cucumber2 which is a unusual plane by doug McHard for free flight , which featured in model flyers mag in 2003 . Well i think that it would make for a nice electric rc conversion the only thing is , has any one built one before ? as i have know idea as to where the cog is , or which would be the best way of controlling it in flight . Can anyone shed any light on the subject ? . I think i will build one out of polystyrene  first so i can test glide it to find its cog .
Stephen Jones12/02/2009 21:13:10
avatar
2901 forum posts
1657 photos

Hi , Wood Worms,
here is a picture of the model i will be building .Unfortunately the great man`s untimely demise occurred before the final version of the plan had been cleared and a build instruction article had been written  . So this will be a challenge that i`am up for .

flytilbroke12/02/2009 22:13:16
avatar
2083 forum posts
5 photos
How can one tell which is it's "A" from it's "E" when the elbow looks like its in the middle
 
Where's a head scratch smiley
 
I look forward to the progress of this one Stephen. Not knowing anything I would take a wild guess at the centre of the top wing. I wonder how wrong I am,, or not.
Bert13/02/2009 08:58:55
521 forum posts
10 photos
A good starting point for a canard is to find the points one third back from the leading edge of the front and rear wings, measure the distance between them and it's two thirds of that distance (from the front)  Obviously, because the main wings are staggered biplane, allowance must be made, so I would take an average for the two thirds main wing position.
 
Bert
Stephen Jones13/02/2009 19:57:02
avatar
2901 forum posts
1657 photos
Thanks for the tip bert i will give that a go on the polystyrene one first . I don't mind cutting more polystyrene if i get it wrong .Have you any idea as to where ailerons and elevators should go on a canard , or should i use elervons like on a delta ? . Oh the back of the plane is where the rudder is flytilbroke .  
Bert14/02/2009 09:06:28
521 forum posts
10 photos
Usually on a canard the ailerons go on the main wing and the elevator goes on the rear of the front wing.
 
Bert
Stephen Jones24/02/2009 17:21:57
avatar
2901 forum posts
1657 photos
Hi fellow wood worms,
The build has been slow due to the fact i have had to scrap the rear fuselage that i made , due to the formers being lob sided . I have had to re do all formers as although they look right on the plan , there not .Along with other problems , by the time its finished i will have had to re draw much of the plan . arr well i know it would be a challenge so the build will go on .
 


flytilbroke24/02/2009 20:03:03
avatar
2083 forum posts
5 photos
I can see how you are getting it together from the pics, nice. An interesting project for sure.
Stephen Jones13/03/2009 22:08:53
avatar
2901 forum posts
1657 photos
Hi fellow wood worms,
Well my loft/shed have been to cold to work in as of late so progress has been slow yet ,again  more errors in the un-finished plan by doug McHard so i will have to re draw all of the plan. Any how here are some more pictures , i do hope it flys when it is finally finished i know it should as i belive he did fly it at one of the natinals and won a award for it .  



Stephen Jones13/03/2009 22:30:52
avatar
2901 forum posts
1657 photos
Hi again,
here is the construction of the rear boom which is my 3rd build now , i wish i could of taken a video of that rudder working . It looks so cool with no visible controls .



  As you can see i gave up on the designers way of building it an chose my own way although doug didn't have a working rudder . 
Stephen Jones23/04/2009 23:40:04
avatar
2901 forum posts
1657 photos




Hi wood worms
Here are some more pictures of the progress so far not too sure how i am going to power it yet as it is a twin i had thought about two electric motors and speed controllers , but then i thought about one motor with a longer drive shaft with a axle  joint so i could drive two props from the one motor as it is a push me pull me  .

Edited By Stephen Jones on 23/04/2009 23:46:18

Edited By Stephen Jones on 23/04/2009 23:50:41

Nobby15924/04/2009 06:57:08
avatar
330 forum posts
44 photos
Cracking build Stephen, thanks for sharing
Andy Harris24/04/2009 08:16:54
avatar
464 forum posts
30 photos
It really does have an oddly graceful look about it!
 
Your build pics give a better impression than the pic of the article.
 
Andy
 
Nobby15914/05/2009 07:47:59
avatar
330 forum posts
44 photos
Any update/progress Stephen
Nobby
Stephen Jones15/05/2009 17:23:24
avatar
2901 forum posts
1657 photos
Hi Nobby,
 
There has been a little progress but not enough to bother posting , i have put things on hold for the moment . As i do not know where the balance point is , i have decided to build a polystyrene chuck glider of the cucumber so i can find where the balance point is and where to put servo for the fore plane and weather there is to much dihedral on the fore plane . I had to build a foam cutter fist and now built the weather is to windy or raining to use out side due to to fumes . But rest assured i`ll keep you posted .
 
cheers steve    
Stephen Grigg15/05/2009 17:47:21
avatar
8691 forum posts
1128 photos
An unusual a?c and interesting build,very challenging and you have a wonderful christian name as well congratulations.
Nobby15915/05/2009 18:30:03
avatar
330 forum posts
44 photos
Thanks for the update Steve,
I have seen the plans on one of the model plans sites, and thought it would be fun
Reading your thread though, I think its a bit beyond my rusty skills at present
Must be frustrating to come so far and be stumped by the CoG, would have thought with the experience on this site someone would have built it and had the answer.
You could have put a pound to a pinch of, that the weather would be against you.
Cracking build though
Nobby
Stephen Jones26/05/2009 22:14:07
avatar
2901 forum posts
1657 photos
Hi again,
 
Well we had a couple of good days here in Manchester so i have been able to go flying and cut some foam parts for the chuck glider / test cucumber here are some pictures just to let you see i have not yet given up on the project. some of the wing panels are finished and covered in brown paper . when i weighed them they are lighter and seem stronger than the traditional built up balsa ones !    
 
The foam parts placed over my plan
 

A close up ,
 
Hope fully this shouldn't take to long to get finished although i don't have  a great deal of time to put in , due to work and home Life` 

Edited By Stephen Jones on 26/05/2009 22:25:18

Nobby15926/05/2009 23:02:42
avatar
330 forum posts
44 photos
Steve,
Lot of effort just to get the CG, almost as much as you put into the model itself !!
Needs is as needs be.
What part of Manchester are you from and where do you fly, me I was brought up in a little village outside Manchester called Salford
Stephen Jones26/05/2009 23:07:09
avatar
2901 forum posts
1657 photos
 Are that be the bad side of town then  
 
Well yes it may seem like a lot of effort but it has only taken me 4 days to get to this stage of the foam build as i could not cut the foam indoors. and i dont mind mind pranging the foam one and if i do it is very quick to cut a new wing weather permiting of coarse .

iam from chadderton myself and i fly from bury or Rochdale  site 
 
i have just noticed that we have something in common !

Edited By Stephen Jones on 26/05/2009 23:09:33

Edited By Stephen Jones on 26/05/2009 23:19:26

All Topics | Latest Posts

Please login to post a reply.

Latest Forum Posts
Support Our Partners
Slec
CML
Subscribe now
Sussex Model Centre
electricwingman 2017
Sarik
Advertise With Us
Latest "For Sale" Ads
NEW POLL - has the pandemic altered your event safety perceptions?
Q: Has the covid pandemic deterred you from attending shows and events in 2021?

 No, I'll be attending just as many as I usually do
 No, but I'll choose my event with greater care
 Yes, I'll attend fewer events going forward
 Yes, I wont attend any where previously I have

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E!